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EARNINGS (LOSS) PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted The computation of basic and diluted earnings per common share for the years ended December 31, 2024, 2023 and 2022 is as follows (in millions, except per share data):
 202420232022
Amounts attributable to Quest Diagnostics’ common stockholders:  
Net income attributable to Quest Diagnostics$871 $854 $946 
Less: Earnings allocated to participating securities5 4 4 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$866 $850 $942 
Weighted average common shares outstanding – basic111 112 116 
Effect of dilutive securities:  
Stock options and performance share units2 1 2 
Weighted average common shares outstanding – diluted113 113 118 
Earnings per share attributable to Quest Diagnostics’ common stockholders:  
Basic$7.78 $7.59 $8.10 
Diluted$7.69 $7.49 $7.97